FindFluentBaseTDocument, TProjectionCountDocumentsAsync Method |
Counts the number of documents.
Namespace:
MongoDB.Driver
Assembly:
MongoDB.Driver (in MongoDB.Driver.dll) Version: 2.12.2+a4a3888f4fb51bb518b1eb5002effc2d47f2ea6a
Syntax public virtual Task<long> CountDocumentsAsync(
CancellationToken cancellationToken = null
)
Public Overridable Function CountDocumentsAsync (
Optional cancellationToken As CancellationToken = Nothing
) As Task(Of Long)
abstract CountDocumentsAsync :
?cancellationToken : CancellationToken
(* Defaults:
let _cancellationToken = defaultArg cancellationToken null
*)
-> Task<int64>
override CountDocumentsAsync :
?cancellationToken : CancellationToken
(* Defaults:
let _cancellationToken = defaultArg cancellationToken null
*)
-> Task<int64>
Parameters
- cancellationToken (Optional)
- Type: System.ThreadingCancellationToken
The cancellation token.
Return Value
Type:
TaskInt64A Task whose result is the count.
Implements
IFindFluentTDocument, TProjectionCountDocumentsAsync(CancellationToken)Remarks
Note: when migrating from CountAsync to CountDocumentsAsync the following query operations must be replaced:
+-------------+--------------------------------+
| Operator | Replacement |
+=============+================================+
| $where | $expr |
+-------------+--------------------------------+
| $near | $geoWithin with $center |
+-------------+--------------------------------+
| $nearSphere | $geoWithin with $centerSphere |
+-------------+--------------------------------+
See Also